Table 4. Kappa coefficient with 95% confidence intervals between three observers using 18F-FDG PET alone and 18F-FDG PET/CT.
|
18F-FDG PET alone
|
18F-FDG PET/CT
|
|||
|---|---|---|---|---|
| Kappa coefficient | 95% Confidence interval | Kappa coefficient | 95% Confidence interval | |
| Site of primary | 1 | 0.88–1.12 | 1 | 0.88–1.11 |
| Localisation of tumour | 0.45 | 0.27–0.62 | 0.90 | 0.82–1.02 |
| No. of nodes | 1 | 0.9–1.09 | 1 | 0.9–1.09 |
| Localisation of nodes | 0.54 | 0.31–0.72 | 0.93 | 0.89–1.06 |
18F-FDG PET=2-[fluorine-18]fluoro-2-deoxy-D-glucose; CT=computed tomography.